title: [Importance of endocardial ECG for successful AV-node modulation in patients with AV-node reentry tachycardia].
abstract: In 49 patients undergoing slow pathway (SP) ablation for AV nodal reentrant tachycardia (AVNRT) the local electrograms of successful and non-successful radiofrequency current applications taken from the mapping/ablation catheter in the posteroseptal space were retrospectively analyzed with respect to the following parameters: 1) ratio of local atrial (A) to local ventricular (V) electrogram amplitude (A/V-ratio), 2) presence of fractionated atrial activity (FAA) or SP potential (SPP), 3) duration of local A electrogram. Ablation sites were classified in 3 groups: group I: no FAA/SPP, A/V-ratio > or = 0.25; group 2: FAA/SPP or A/V-ratio < 0.25; group 3: FAA/SPP and A/V-ratio < 0.25.
  
  
  RESULTS
  In all patients SP ablation was successful after 4.6 +/- 4.4 applications. Successful ablation sites had a significantly smaller A/V-ratio than non-successful ones (0.2 +/- 0.04 vs. 0.44 +/- 0.06, p = 0.023). The local A electrogram duration was not significantly different (72.3 +/- 2.14 vs. 71 +/- 1.35 ms, p = n. s.).
  
  
  CONCLUSIONS
  1) In SP ablation of AVNRT the local A/V-ratio is significantly smaller in successful compared to non-successful ablation sites. 2) Local A electrogram duration does not correlate with ablation success. 3) A local A/V-ratio of < 0.25 and the presence of a SPP or FAA are correlated with ablation success.
authors.affiliation: Medizinische Klinik 1, Klinikum der RWTH Aachen.
authors.forename: K
authors.initials: K
authors.lastname: Ziegert
authors.forename: C
authors.initials: C
authors.lastname: Stellbrink
authors.forename: P
authors.initials: P
authors.lastname: Schauerte
authors.forename: B
authors.initials: B
authors.lastname: Diem
authors.forename: P
authors.initials: P
authors.lastname: Hanrath
mesh_terms: D000328:Adult; D017115:Catheter Ablation; D004562:Electrocardiography / Q000379:methods; D004699:Endocardium / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis* / Q000601:surgery
vernacular_title: Bedeutung der endokardialen Elektrogramme für den Erfolg der AV-Knoten-Modulation bei Patienten mit AV-Knoten-Reentry-Tachykardien.